Still not fixed in 16.04. I just upgraded from Debian wheezy where one
nudge of the scroll wheel changed the alsamixer control by a consistent
5dB. This was bad already, because 5dB is too coarse. It feels like a
compromise between those who want to use the scroll wheel for fine
volume adjustments (which would require a step no larger than 2dB) and
those who want to use it as a mute button (see Bug #551725).
Unfortunately this compromise benefits nobody, because it falls in
between the only two sensible use cases.

The slider behavior in Xenial is worse. The amplitude follows what
appears to be a quadratic function. This feels like someone lacking
proper knowledge about audio had a go at fixing the previous volume
slider that, being a bad compromise, didn't work for anyone. Step size
varies depending on the slider position. I use sensitive earphones that
are already quite loud with the slider near the leftmost position, where
step sizes are about 8dB, which is awful.

Anyone touching code that involves audio, should perhaps first read my rant 
about software volume controls:
http://www.dr-lex.be/info-stuff/volumecontrols.html

The position of the slider should map linearly to dB values, or in other
words the volume multiplication factor must be an exponential function
of slider position. It _will_ be unavoidable that for some users the
slider will either have a ‘dead zone’ or a ‘too loud’ zone, because the
maximum loudness of connected loudspeakers or headphones can vary
wildly.

Any interface that changes the volume by discrete increments like volume
keys or the scroll wheel, must use fixed dB steps, in other words a
fixed multiplication factor for linear amplitude. A good size for this
step is 2 dB. To cater for those who only want to use the volume keys or
scroll wheel to quickly make huge volume adjustments, the step size
should indeed be configurable as this bug suggests. A drop-down menu
with values of 1dB, 2dB, 3dB, and 6dB would be sufficient.

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https://bugs.launchpad.net/bugs/871133

Title:
  Volume Step not changeable in Unity and GNOME desktops

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